Michelle lives one block south of the bank at what point is her house located

There's not enough information given to answer the question, because we don't know where the bank is located.  All we know is exactly what we're told: Her house is located one block south of the bank, wherever THAT may be.

Perhaps a picture would help us answer this question.  To be honest, I kind of suspect that there IS a picture that goes along with it, but for some reason you decided not to share the picture with us.

ab will be equal to

the expression (1.26)2t reveals the approximate rate of increases in the number of plants semiannually.

hope this : )